package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.WatchService;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Slf4j
@Service
public class ReportServiceImpl implements ReportService {


    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;



    /**
     * 统计指定区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 计算日期，装载TurnoverReportVO.dateList;
        // begin---end  的所有日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double>turnoverList = new ArrayList<>();
        //装载TurnoverReportVO.turnoverList  查数据库  需要和上文一一对应
        for (LocalDate date : dateList) {
            // 状态为已完成的订单合计
            // select sum(amount) from orders where order_time> and order_time<  and status = 5
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0 : turnover;
            turnoverList.add(turnover);
        }
        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }


    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 计算日期，装载dateList;
        // begin---end  的所有日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }


        // 存放新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        // 存放总用户数量
        List<Integer> totalUserList = new ArrayList<>();


        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            // 先放endTime 查询总用户数量
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);
            // 再放beginTime 查询新增用户数量
            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }


    /**
     * 订单统计数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 计算日期，装载dateList;
        // begin---end  的所有日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            Integer total = orderMapper.countByMap(map);
            // 查询每天的有效订单数
            map.put("status", Orders.COMPLETED);
            Integer completed = orderMapper.countByMap(map);

            orderCountList.add(total);
            validOrderList.add(completed);

        }

        // 计算总的订单数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 计算总的有效订单数量
        Integer validOrderCount = validOrderList.stream().reduce(Integer::sum).get();
        // 计算订单完成率
        Double orderCompletionRate = 0.0 ;
        if(totalOrderCount.doubleValue()!=0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * Top10统计
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");


        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     * 导出表单
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
//        查询数据库，获取所需数据    近30日数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
//        查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(
                LocalDateTime.of(dateBegin, LocalTime.MIN),
                LocalDateTime.of(dateEnd, LocalTime.MAX)
        );

//        通过POI将数据写入excel文件中
        // 输入流对象
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/table/运营数据报表模板.xlsx");

        // 基于模板文件创建新的excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 填充数据
            // 获取文件中的一个表格标签页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 获取行,列(获取【第2行，第2列】的元素)
            // 填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+" 至 "+dateEnd);
            // 获取第四行
            XSSFRow row = sheet.getRow(3);
            // 填充第四行的三个元素
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            // 获取第五行
            row = sheet.getRow(4);
            //填充第五行的两个元素
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            // 填充明细数据
            for(int i=0 ; i< 30;i ++){
                LocalDate date = dateBegin.plusDays(i);
                // 查询某一天的数据
                BusinessDataVO businessDataVO1 = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                // 获取某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDataVO1.getTurnover());
                row.getCell(3).setCellValue(businessDataVO1.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO1.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO1.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO1.getNewUsers());
            }



            //        通过输出流将excel文件下载到客户端浏览器中
            // 创建输出流对象
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);


            // 关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }
}
